Amateur ExtraE9H01
When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?
D
Answer
Antennas and transmission lines
Type
A
Its overall length must not exceed 1/4 wavelength
B
It must be mounted more than 1 wavelength above ground
C
It should be configured as a four-sided loop
D
It should be at least one wavelength long
Answer Notes
A Beverage antenna is a directional, traveling-wave wire antenna typically installed close to the ground, heavily favored by amateurs for low-noise receiving on lower frequency bands like 160 or 80 meters.
To achieve its characteristic directivity and performance, it relies on the phase relationship between the radio wave traveling through space and the induced wave traveling along the wire. For this traveling wave effect to accumulate sufficient signal strength and directional pattern, the antenna wire must be at least one full wavelength long at the desired frequency.
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Which is generally true for 160- and 80-meter receiving antennas?